﻿//
// Copyright 2023 Google LLC
//
// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License.  You may obtain a copy of the License at
// 
//   http://www.apache.org/licenses/LICENSE-2.0
// 
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied.  See the License for the
// specific language governing permissions and limitations
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using Google.Solutions.Common.Linq;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Linq;

namespace Google.Solutions.IapDesktop.Core.ClientModel.Protocol
{
    /// <summary>
    /// Registry for protocols, intended to be used as a singleton.
    /// </summary>
    public class ProtocolRegistry
    {
        private readonly ConcurrentBag<IProtocol> protocols
            = new ConcurrentBag<IProtocol>();

        public IEnumerable<IProtocol> Protocols => this.protocols;

        public IEnumerable<IProtocol> GetAvailableProtocols(
            IProtocolTarget target)
        {
            return this.protocols
                .EnsureNotNull()
                .Where(p => p.IsAvailable(target));
        }

        public void RegisterProtocol(IProtocol protocol)
        {
            this.protocols.Add(protocol);
        }
    }
}
